I'm fully aware of that, but there's many financial instruments to hedge against inflation. To that end, I'd sooner put my money into Rolex watches or sneakers than cryptocurrency.
The purchasing power I might lose from a mere $20 is of course irrelevant. If I put it into Bitcoin it might turn into $100 or $200 at an off-chance, but that has nothing to do with inflation. Bitcoin just isn't that correlated with cash. If I wanted to make a $20 bet that the dollar inflates dramatically, I would buy an option to buy gold at $5000.